What is used to make panel joints weather tight?

• A. Caulking
• B. Sealant tape
• C. Gaskets
• D. Soldering

Answer: (A)

Sealing joints between panels to keep water and air from penetrating the wall is the key idea. Caulking is a flexible sealant applied into the gap between tilt-up panels, forming a continuous, elastic barrier that can accommodate movement from temperature changes, wind, and settling. It adheres well to concrete and remains flexible over time, making it effective for weatherproofing the joint.

Soldering isn’t suitable here because it’s a heat-based process used for metal joints, not concrete panel joints. Gaskets require a groove and compression to seal, which isn’t practical for irregular, field-assembled panel joints. Sealant tape can provide some surface-level sealing but often doesn’t fill irregular gaps or handle the movement and moisture demands of exterior tilt-up joints the way caulking does.